Fozzie the Bear of course! "Wocka Wocka Wocka!" I just love Fozzie's sense of humor and he always is happy.
Who doesn't love the bear?
I never really watched the show that often, but fell for Fozzie in the first Muppet movie. C'mon, the song 'Moving Right Along' was a classic for that movie!
Plus, Fozzie has (at least from what I remember) always been the loyal friend. Loyalty is big in my book for a Muppet!
A close runner up: the always loveable Beeker!